From The Collaborative International Dictionary of English v.0.48:

Retroversion \Re`tro*ver"sion\, n. [Cf. F. r['e]troversion. See
   A turning or bending backward; also, the state of being
   turned or bent backward; displacement backwards; as,
   retroversion of the uterus.
   [1913 Webster]

   Note: In retroversion the bending is gradual or curved; in
         retroflexion it is abrupt or angular.
         [1913 Webster]
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